
Keywords: PBO; poly-p-phenylenebenzobisoxazole; PBT; poly-p-phenylenebenzobisthiazole; PIPD; polypyridobisimidazole; WAXS; wide-angle X-ray scattering; SAXS; small-angle X-ray scattering; Fiber structure; Poly-p-phenylenebenzobisoxazole; Miscibility; Pyridylene rin